Phase transformation of boron nitride under hypothermal conditions

Journal Article · Mon Jun 15 04:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.02.021· OSTI ID:21370417

Gang, Lian; Xiao, Zhang ^[1]; Lingling, Zhu ^[1]; Qilong, Wang ^[2]; Xutang, Tao ^[1]

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1. State key Lab of Crystal Materials, Shandong University, Jinan 250100 (China)
2. School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100 (China)

Phase transformation among different boron nitride (BN) phases in hydrothermal solution was investigated. It was found that hexagonal boron nitride (hBN) firstly formed in the solution at relatively low temperature (i.e., 220 deg. C). After that, a spot of hBN began to transform into wurtzite boron nitride (wBN) and cubic boron nitride (cBN) at 230 deg. C. More and more hBN converted into wBN and cBN with the increase in temperature, and this transformation process completed at 300 deg. C. In this paper, we have explained the mechanism of the above phase transformation by using a reported 'puckering mechanism'. - Graphical abstract: Phase transformations from hBN to wBN and cBN happened with the temperature increasing from 230 to 300 deg. C under hypothermal conditions, and nearly pure cBN has been synthesized at 300 deg. C and 12 MPa.

• OSTI ID: 21370417
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 6 Vol. 182; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON COMPOUNDS
BORON NITRIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
HEXAGONAL LATTICES
NITRIDES
NITROGEN COMPOUNDS
PHASE TRANSFORMATIONS
PNICTIDES
PRESSURE RANGE
PRESSURE RANGE MEGA PA
PRESSURE RANGE MEGA PA 10-100
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K